Water Softener Size Calculator
Estimate preliminary water-softener grain capacity, daily treatment load, regeneration volume, salt use and nominal unit count.
Default project preview
50,400 grains
Daily treatment load
6,000 grains/day
Effective hardness
20 grains/gal
Water per cycle
2,100 gal
Nominal units
2
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Daily grains = household water use × effective hardness. Cycle capacity = daily grains × regeneration days × reserve factor. Nominal units are rounded up by entered unit capacity.
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BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Water Softener Size Calculator questions
Why adjust hardness for iron?+
Dissolved iron adds treatment demand; the adjustment factor is editable because treatment assumptions vary.
Is nominal grain capacity always usable?+
No. Usable capacity depends on resin volume, salt dose and efficiency settings.
Does this check peak flow rate?+
No. Service flow and pressure loss must also match the household demand.